Flame photometric detector

Patent metadata

Field	Value
Publication number	US-11506643-B2
Application number	US-202016881296-A
Country	US
Kind code	B2
Filing date	May 22, 2020
Priority date	May 22, 2020
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

A flame photometric detector for a process gas chromatograph is provided. The flame photometric detector includes a combustion chamber body defining a combustion chamber therein. A sample inlet tube is configured to introduce a process gas sample into the combustion chamber. An ignitor is configured to initiate combustion within the combustion chamber. A thermocouple assembly is configured to provide an indication of temperature within the combustion chamber. The sample tube has an end that is adjustable relative to the combustion chamber.

First claim

What is claimed is:

1. A flame photometric detector for a process gas chromatograph, the flame photometric detector comprising:
a combustion chamber body defining a combustion chamber therein;
a sample inlet tube configured to introduce a process gas sample into the combustion chamber;
an ignitor configured to initiate combustion within the combustion chamber;
a thermocouple assembly configured to provide an indication of temperature within the combustion chamber;
wherein the sample inlet tube has an end that is adjustable relative to the combustion chamber; and
a gas mixer threadably disposed within the combustion chamber body, and wherein rotation of the gas mixer affects the adjustable position of the end of the sample inlet tube relative to the combustion chamber.

2. The flame photometric detector of claim 1 , wherein the combustion chamber has a substantially half round shape.

3. The flame photometric detector of claim 1 , wherein the combustion chamber has a substantially flat bottom.

4. The flame photometric detector of claim 1 , wherein the ignitor and the thermocouple assembly are mounted to a single tube that extends into the combustion chamber.

5. The flame photometric detector of claim 1 , wherein the adjustable position of the end of the sample inlet tube is pre-optimized for detector response.

6. The flame photometric detector of claim 1 , wherein the:
a flame photometric detector is operably coupled to at least one chromatographic column and is disposed within a temperature-controlled oven, the flame photometric detector being configured to combust a sample of process gas and provide an indication of a flame combusting the sample.

7. The flame photometric detector of claim 6 , wherein the ignitor and the thermocouple assembly enter the combustion chamber of the flame photometric detector via a single aperture.

8. The flame photometric detector of claim 7 , wherein the ignitor and the thermocouple assembly are mounted to a single tube that extends into the combustion chamber.

9. The flame photometric detector of claim 8 , wherein the single tube is formed of ceramic.

10. The flame photometric detector of claim 6 , wherein the flame photometric detector includes internal combustion exhaust passageways.

11. The process gas chromatograph of claim 6 , wherein the combustion chamber has a substantially flat bottom.

12. A flame photometric detector for a process gas chromatograph, the flame photometric detector comprising:
a combustion chamber body defining a combustion chamber therein;
a sample inlet tube configured to introduce a process gas sample into the combustion chamber;
an ignitor configured to initiate combustion within the combustion chamber;
a thermocouple assembly configured to provide an indication of temperature within the combustion chamber; and
wherein the combustion chamber includes a flat surface proximate an end of the sample inlet tube, a partially round surface having a zenith distal the flat surface, and a major are intersecting the zenith and contacting the flat surface.

Assignees

• Rosemount Inc

Inventors

• Zhang Edward
• Watkins Willis
• Black Steven S

Classifications

• G01N30/74 Primary

  Optical detectors {(measurement of intensity, velocity, spectral content, polarisation, or phase of infrared, visible or ultraviolet light G01J)} · CPC title

• G01N30/64 Primary

  Electrical detectors · CPC title

• G01N30/20

  using a sampling valve · CPC title

• G01N2030/685

  flame photometry · CPC title

• G01N30/68 Primary

  Flame ionisation detectors · CPC title